J R Danielson
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Explore the profile of J R Danielson including associated specialties, affiliations and a list of published articles.
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31
Citations
37
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Recent Articles
1.
Danielson J, Gribakin G, Arthur-Baidoo E, Surko C
Phys Rev Lett
. 2024 Oct;
133(12):123001.
PMID: 39373452
High-resolution measurements of the positronium formation cross sections for positron energies from threshold to 10 eV are presented for aniline (C_{6}H_{5}NH_{2}), pyridine (C_{5}H_{5}N), and cyclopentane (C_{5}H_{10}). The data reveal that...
2.
Ghosh S, Danielson J, Surko C
Phys Rev Lett
. 2022 Sep;
129(12):123401.
PMID: 36179198
Positrons attach to molecules in vibrationally resonant two-body collisions that result in greatly enhanced annihilation rates. Measurements of annihilation as a function of positron energy are presented for benzene using...
3.
Singer M, Konig S, Stoneking M, Steinbrunner P, Danielson J, Schweikhard L, et al.
Rev Sci Instrum
. 2022 Jan;
92(12):123504.
PMID: 34972413
Preliminary experiments have been performed toward the development of a multi-cell Penning-Malmberg trap for the storage of large numbers of positrons (≥10 e). We introduce the master-cell test trap and...
4.
Ghosh S, Danielson J, Surko C
Phys Rev Lett
. 2020 Nov;
125(17):173401.
PMID: 33156644
Positrons attach to most molecules through Feshbach resonant excitation of fundamental vibrational modes, and this leads to greatly enhanced annihilation rates. In all but the smallest molecules, vibrational energy transfer...
5.
Horn-Stanja J, Nissl S, Hergenhahn U, Pedersen T, Saitoh H, Stenson E, et al.
Phys Rev Lett
. 2018 Dec;
121(23):235003.
PMID: 30576209
An ensemble of low-energy positrons injected into a supported magnetic dipole trap can remain trapped for more than a second. Trapping experiments with and without a positive magnet bias yield...
6.
Stenson E, Nissl S, Hergenhahn U, Horn-Stanja J, Singer M, Saitoh H, et al.
Phys Rev Lett
. 2018 Dec;
121(23):235005.
PMID: 30576193
The high-efficiency injection of a low-energy positron beam into the confinement volume of a magnetic dipole has been demonstrated experimentally. This was accomplished by tailoring the three-dimensional guiding-center drift orbits...
7.
Natisin M, Danielson J, Gribakin G, Swann A, Surko C
Phys Rev Lett
. 2017 Sep;
119(11):113402.
PMID: 28949225
Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding and vibrational Feshbach resonances. The existing theory describes this phenomenon successfully for the case of infrared-active vibrational modes that...
8.
Hurst N, Danielson J, Dubin D, Surko C
Phys Rev Lett
. 2016 Dec;
117(23):235001.
PMID: 27982636
Experiments and vortex-in-cell simulations are used to study an initially axisymmetric, spatially distributed vortex subject to an externally imposed strain flow. The experiments use a magnetized pure electron plasma to...
9.
Hurst N, Danielson J, Baker C, Surko C
Phys Rev Lett
. 2014 Jul;
113(2):025004.
PMID: 25062198
The perpendicular dynamics of a pure electron plasma column are investigated when the plasma spans two Penning-Malmberg traps with noncoinciding axes. The plasma executes noncircular orbits described by competing image-charge...
10.
Jones A, Danielson J, Natisin M, Surko C
Phys Rev Lett
. 2013 Jun;
110(22):223201.
PMID: 23767720
Vibrational Feshbach resonances are dominant features of positron annihilation for incident positron energies in the range of the molecular vibrations. Studies in relatively small molecules are described that elucidate the...